<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  
  <script>
    let str = '<p></p>'
    let arr = str.split('><')  
    console.log(arr)  //  ['<p', '/p>'] 数组长度为2
    let str = '<p> </p>'
    let arr = str.split('><') 
    console.log(arr); // 输出 ['<p> </p>']  数组长度为1
  </script>
</body>
</html>